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TCPIP Services, Programming Interfaces, Sockets API, $QIO, TELNET Port Driver QIO Interface, Passing Parameters to the TELNET Port Driver
 *Conan The Librarian 

    The IO$_TTY_PORT function is used to pass $QIO parameters
    through the terminal driver to the TELNET port driver. The actual
    subfunction is encoded as an option mask and may be:
    o  IO$M_TN_STARTUP - Bind socket to a TELNET terminal.
    o  IO$M_TN_SHUTDOWN - Unbind socket from a TELNET terminal.
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